Sanding machine



R. A. REID SANDING MACHINE Aug. 16, 1932.

Filed May 21, 1930 2 Sheets-Sheet l (fgzaezzfariw Mew aw R. A. REID SANDING MACHINE Aug. 16, 1932.

Filed :May 21, 1930 2 Sheets-Sheet 2 afi iorzze o" Patented Aug. 16, 1932 RAYMOND a. REID, or CEDAR narmslrown sannmegmdmnn Appli cationfiled m ge; 1980; .7 Serial mi. 454,480. L I;

, efiicient, economical apparatus is afiorded.

For instance, it is my purpose to provide such a sanding machine of the type in which,

a motor drivenasandingdrum is mounted within a casing and the casing isof'suchnovel constructionv asj'to properlycontrol the air currents through the machine. i In this connection'fit ismy purpose t0,pro-

vide adrum having fan blades on the ends thereofiand to make theinterior of the drum in'such shapeasto properly'conduct and discharge the" air in such a "manner as'to cool the,

air and dirt and sand. w v

Another'purposeis to provide such asan der having a novel construction for mounting the sanding drum. I I

With these andother objects in View, my invention consists in the constructin,; ar-' momma-a toallow a minimum carry over of I'ian-gement and combination of the various parts, of my sanding machine, whereby the objects contemplated are attained, as-here* inaftermore fully set forth, pointed out in my claims, and illustrated-in the accompany ing drawings, in which; L

Figure 1 shows'a perspective View of a sanding machine embodying my inventiom;

Figure 2,-is a; vertical, sectional View through the machine taken on the line 22.0f Fi-gure1-. i -i i i f- 1 I Figure 3 is a transverse, sectional view of the machine taken on the line 2-2 of Fig- Figure 4."isasiinilar View or the casing.

alone. 7

tion; and e Figure 6 shows a detall, sectional: vlew taken. onthe-line 6'6;of Figure 2.. v

era'llyby the reference character A.

member 11' may be locked on the H Figure: isa .detail sectional takenon the line 5-5- of. Figure 2,. parts being broken away and parts being shown. in sec-- Thecasing comprises alo'wer halfor member and an upper halfor member 11. The lower" half -isjprovided with an openin in a portion of the sanding drum' projects. j

The lower half is also provided with a base 13 projecting forwardly and rearwardly from 1 the casing; j

For convenience in describi'ng'the machine, I vwill refer to that endwhich is" adjacent {to the operatoras the front of the machine. I

the. front and'rear ofl'th'e base 13- are small transverse rollers 14' adapted totrav'el on a flooro'r' an article being sanded in} such afway as to support the machine slightly; above thesurface on v'hi'ch it travels as shown ih FigureQ. 1 Y 4 :5 The upper casin member'll hasin its'for wardlportion and its. top an opening '15; preferably rectangular in section for the at-j tachment' of a dust collecting bag or other dustfconductor or receptacle;- This upper cas-- ing member 11 has near its rear part agsuitable handle 16 and at its front, part an operating handle '17. w l

,One'of the purposes of my invention is to provide means whereby the upper casing" 7 ower, cas--' ing member 10 so asto allow some up and gown adjustment of the-upper casingmem- This is done because-the sanding drum is;

i mounted on springs "as hereinafter more fully explainedyand by providing for theup and; down adjustment of the upper casing member 11, it's up'per limit of adjustment canbe its bottom, as indicated at 12,, through w ich i i regulated; and it Willthusserve to limit the maximum height atiwhich the sanding drum mayirest upon'its springsupports to allowthe sanding drum 'to be depressed manually; atwill bythe operator. j

For thus connecting the upper and lower casing memhers,'they are hinged together-as;

, at '18 at the ,back of'the machine.

At the front of the machine, the arms of a yoke 19 are pivoted as at 20 to the lower forward'fedge of thefu'ppercasing member. The'l'ower casing member is provided "at the front with a lug 22, which may be received between the arms of the yoke 19," as

I shown in Figure 2. In the closed end-of the yoke 19 is mounted an adjusting screw 23 for providing the desired adjustment.

It should be mentioned that the front part of the lower casing member is rabbeted as at 24 to afford a better joint. At the sides of the casing are. openings 25, which, may be covered by split perforated cover, plates 26. The upper edges of the lower cover plate members 26 are provided with opposite slots 27 and in the lower parts of theseslots are seated springs 28 (see Figures 1 and upon l -is provided on its periphery with a felt covwhich the motor shaft ends hereinafter mentioned may be supported.

The casing is provided at each side with a rib 30 shown partly in .full linesand partly in dotted lines in Figure 2, extending adjacent to the inner surface of the periphery of the'casing'from above the joint line, as shown, downwardly and thence forwardly beyond the opening 12. This rib is to afford amore nearly airtight joint as will be hereinafter again referred to.

The frontportion of the'lower casing mem ber 10 is providedon its interior with a thickened portion .32 (see Figure 4) extend-i ing from the opening 12 upwardly to the upper edge of said member. This thickened portion 32is curved from its lower parta f little beyond theopening 12 upwardly and.

' inwardly to the upper end of the t-hickened ber 11 is extended ,at its central portionlsub portion 32, as shown in Figure 4, tolthus leave,

at its sides air release spaces 34, thepurpose of which will be later more fullyreferred to- Thefront wall of the upper casing memstantially midway between its sides straight upwardly to the opening'15 as indicatedlat 35 in Fi re 2.

On the inside, the sides of the uppercas ing member 11 near the front portion thereof arecurved inwardly and upwardly as indicated vat36 in-Figure 6 for; better directing the air through the outlet 15.

Spaced rearwardly. from the front wall portion 35 (see Figure2) is a transverse par- 3 close to ,the

tition member .37, extending downwardly from the opening 15 to a line close to the path of travel of the periphery. of the sanding drum.

Spaced .rearwardly the front wall portion 35 (see Figure 2) is a transversepar tition member 37 extending downwardly from the opening15 to a line close to the path I V of travel of the ti0n-38a is another partition 39 and spaced therefrom rearwardly a partition 40 and spaced rearwardly therefrom a partition 41a and rearwardly therefrom is a partition 42.

All of these partitions project downwardly to lines close to the path of travel of the drum. The partition 39 extends downwardly from the rear edge of the opening 1521s shown.

The purpose of these partitions will be again referred to.

. s 5 4% provide a hollow sanding drum 43, which The side walls withperforations 46 (see for instance Figure 3) for the passage of air.

.At the centers of the sides, of the drum are heavyjournals 47 inwhich rotate the. shaft 48 of the motor stator. 49.. The ends of the shaft 48 are flattened as at 48a, so that when they are inserted in the slots -28 hereinbefore describedthe shaft and the stator cannot rotate, but the rotor can rotate on the shaft.

The current conducting cable. 50 may extend to and through the handle 17 and thence; 05

through one end of thefshaft 48 tothe motor. The electric connections are ofthe ordinary construction and need no further" present description. The handle '17 may be provided with a switch ifdesired. I

It will be noted that the periphery lof the sanding drum extends close'tothe sidewalls of the casing, but that the side walls .of, the

sanding drum are arranged inwardly from the casing. The sanding drum is provided with-fan blades 52, as more particularly shown in Figure 2.

I'shall now describe tion. l

7 Practical operation Before beginning the operation ofthe machine, the sanding drum is adjustedas to height. so as to'regulate itsabrasive action; according to the particular job upon which the machine is'at the, time operated. j The shaft ends rest upon the springs 28,

which, of course, tend to raise the drum to its maximum adjuste'd height: The lower edges of the sides of the upper casing member-11' are provided with adjusting screws 51 which may be regulated toglevel the sanding drum with relation to the bottom of the frame.

Another and important regulation is pro vided by means of the adjustingscrew 23 (see Figures 1 and 2). By adjusting the screw 23. the height to which the upper casing member 11 may be-pushed is determined,

and the height of the casing member 11 thus regulates .the maximum height of-the drum.

Thus, by means .ofthe. screw 23, the spring of thefdrum'43 provided:

the practical apart the motor for-cooling. it and-drive air out-- wardly at their ends.

create acurrent of air for driving the; sand and. dirt-ou-tjthrough the opening-'15 into the dust collecting bag, not shown.

- Thereis, of course, a tendency for the fan blades and forthe motor to drive air radially outwardly aroundthe edges of the sanding drum, There is also a tendency .to carry air pastthe opening 15and. around the drum. These tendencies are'controlled and such movements of air practically eliminated by theconstr-uction of my-machine. The ribs 30 abovedescribed fitquite snugly. with relation tothe felt covering member i0 of the sanding drum, and thusprevent thepassage of air aroundthe edge of the drum' fromtherib 42,- shown in Figure2, tothe lower ends of the ribs,. one of which is: indicated, at a? in so" Figure=2.

Thethickened portion 32., and the air release spaces 34 serve importantfunetions in: controlling .theactionot the sander dust. as? it leaves the work. The sander dust is car.- ried upwardly with-the currents of air above mentioned. along the. surface. of the sanding drum, until the dust-andair reach the. air release portions or spaces 34,. where the; dust joins or is joined by air column released aroundfthe endsof the drum and created in;

partby the drumand in partby the fan.

The air and dusttendttopass outthrough the opening 15 and the shape-of the portions 32: and 34 (Figure 4) andv of. theinterior. of;

L the front upper. portionxof the upper casing member 11; cause the dust to be formed into a narrow stream, leaving the air at the outer sides of the housing substantially clean and free from, dust.

It. 's important. that the sanding drum should run in. fairly closehcontact; with the portion 42. If. the sander were not .soydeof the dust through the opening ..12. I

I shall now refer to the function of the partitions or baffles or ribs 37 to 42 inclusive.

If the housing were smooth. ,inits upper interior, there would be .a. strong Suction.

The rotation of, the-motoralso temisv top This is animportantfea. i ture of the present .deviceQI created -;bythe -.revolv-ing= drum-.in' :the' ham ing due to contri'fugalforce and. the air m..- rents, which would-have a tendency to pull the dust overpast the exit opening-around the. drum f and: cause it..to berdischarged' 6 through-theopening inv the bottom of the housingthrough which the; drum act'son the work.-

The dust wouldrthen: be blown. into the air. "-Tofprevent this] have provided the series. Jot partitions :or ribs mentioned, which extend quite. close to the' surface the sanding drum. The partitions 37 38., 38a and Y39 are engaged bythe air and dust and cause the-air and dUStttO be' directed.

vertically upwardlyqand outwardly through the opening 1 5. They also serve to-break the; current of air, which would. otherwise pass aroundqthe-drum. r u 1 The partitions.38a,39,40, 41'and 42 also: serveto slow down and stop the movement of the airaround the drum by causing it to be alternately: compressedand releasedras it. were. That is the'air is compressed as-it strikes the front sides of these partitions andE what air escapes underthem is then released; so that; the tendency; of the air to continueto. pass around the .drum isalm ost entirelyel'iminatedand any pressure becomesless'and: less. I have shown in my drawingsandex-.- plained; in my description details-of structure whereby a-practica-l embodiment of myinvention may be; had, but it is 'not'zmy purpose to limit myself to the exact structureshown, andIdesire to cover bymy claims any niodificationsinstructureor use of mechanical equivalents, which may be reasonably ins cludedwithin their scope. I

. "I claim as my invention 1.. In a sanding machine, a casing compris;

ing lower and upper members, meansforhinging said-members together at'one end, means.

for locking said membersv together at the other, end, capable of adjustment for allowing variation in theadjustment of the members with. each. other, said casingv having an opening in its bottom,'and' shaft'receivingvertical slots in the lower; member, a sanding drumv in the casing, .formlng also amotor rotor, astator in the drum having fixed shaftends non-rotatably received, in said slots, for:

vertical sliding adjustment, springs for supporting the shaft ends .in'said slots, whereby the sander drumis spring supported and its highest position may be, limited by, adjust ment of said secondmeans.

tical shaft receiving slotsat its sides inthe:

lower .member, a, sanding drum in the-casing having stub shafts ,recelved 1n sa1d.slots,.

for. vertical; adiustment springs for support-T '4? and 'with'airrelease spaces at the sides of sai'd lastmamed'means being adjustable so that the drum may be yieldingly supported on'said springs and its maximum height may be regulated-by the upper casing member andthe adjustment of said securing means.

:In a sanding machine, a substantially V cylindrical casing having an opening inits portion'wider at their upper than at their bottom and having'an opening in its top adjacentto one end for the egress of dust, a sanding drumrotatably mounted in said casing, said casing having-on its interior in its end below said-second opening a portion fitting closely'to-th'e surface of the drum and extending from said first openingupwardlyandwith air-release spaces at the sides of said'portion'widerat their upper than at their lower ends. I

4. In a sanding machine, a substantially cylindrical casing having an opening in its bottom and having an opening in its top adjacent to one end for the egress of dust, a sanding drum rotatably mounted in said casing, said casing havingon its interior in its'end below said second opening a portion fitting closely to the surface of the drum and extending from said first opening upwardly and'with air release spaces at the sides of said lower ends, said at one end. 1

' 5.=In a sanding machine, a substantially sanding drum having a fan v cylindrical casing-having an opening in its bottom-and having an opening in its top adjacent to-one'end' for the egress of dust, a sandingdrum rotatably mounted in said casing, said'ca'sing having on its interior in its end below said second opening a portion fitting closely to the surface of'the drum and extending from said first opening upwardly said portion wider at their upper than at theirlower ends, said casing having at its interior at'its other end' inwardly extending ribs for preventing the escape of air around the periphery of the drum, said ribs extending from said first opening substantially a quarter way around the casing.

"6. In a sanding machine, a substantially cylindrical casing having an opening in its bottom and having an opening in its top adjacent to one end for the egress of dust, a sanding drum rotatably mounted in said c'asing,said casing having on its interior'in its end below said second opening a portion fitting closely to the surface of the drum and extending from said first opening upwardly and withair release spaces at the sides of said portion wider at their upper than at their lower ends, said casing having at its interior at'its other end inwardly extending ribs for preventing the escape of air around ,the

periphery of the drum, said ribs extending from said first opening substantially a quarter way around the casing, said sanding drum having a fan formed thereon.

7 :In -'a sanding "machine, a substantially cylindrical casing having an opening in its bottom and having anopening in its top adjacent to one end 'fo'r theegress of dust, a sanding drum rotatably mounted in said cas ing, said casing having on'its interior in its end below said second opening a. portion fitting closely to the surface 0f the 'druln'and extending from said' first; opening upwardly and with-air'releasespaces at'the sides of said portion wider at their upper than at their lower ends, said casing having a series of transverse partitions extending across said opening and extending inwardly substantially to said sanding drum. a 8. In a sanding machine, a substantially cylindrical casing having an opening in its bottom and having an opening in its top adjacent to one. end for the egress of dust, a sanding -drumrotatably mounted in said casing, said casing'having on its interior in its end below said second opening a' portion fittingcloselyto the surface of the 'drum'and extending from said first opening upwardly and with air release spaces at the sides of said portion wider at their upper than at their lower ends, said casing havinga series of transverse partitions extending across said opening and "extending inwardly substantially to said sanding drum, and additional spaced transverse partitions beyond said opening in the travel of the drum extending inwardly from thewall of the casing sub-. stantiallyto the-drum.

9; In a sanding 'machine," a substantially cylindrical casing having an opening in its bottom and having an opening in its top adjacent to one end for ,the egress of dust,fa sanding'drum rotatablywmounted in said casing, said casing having'on its interior in its end below said second opening va portion fitting closely to the surface of the drum and extending from said first opening upwardly andv with air releasespacesat the sides of said portion wider at their upper than at their lower ends, said casinghaving at its interior at its other end inwardly extending ribs for preventing the escape of. air around the periphery of the drum, said ribs extending from said first opening substantially a quarter way bottom and having an opening in its top ad jacent to one end for the egress of. dust, a:

sanding drum rotatably mounted in said hasing, said casing having 'onjits interior in its end below said second opening a portion fitting closely to the surface of the drum and extending from said first opening upwardly and with air release spaces at the sides of said portion wider at their upper than at their lower ends, said casing having at its interior at its other end inwardly extending ribs for preventing the escape of air around the periphery of the drum, said ribs extending from said first opening substantially a quarter way around the casing, said casing having a plurality of transverse partitions in its upper portion extending inwardly from the top of the casing substantially to the sanding drum, and means for yieldingly mounting the drum, said casing being made in upper and lower parts, the upper part serving to limit the upward movement of the drum, and means for locking the upper to the lower casing part in different positions against further upward movement.

11. In a sanding machine, a substantially cylindrical casing having an opening in its bottom and having an opening in its top adjacent to one end for the egress of dust, a sanding drum rotatably mounted in said casing, said casing having on its interior in its end below said second opening a portion fitting closely to the surface of the drum and extending from said first opening upwardly and with air release spaces at the sides of said portion wider at their upper than at their lower ends, said casing havinga series of transverse partitions extending across said opening and extending I inwardly substantially to said sanding drum, and additional spaced transverse partitions beyond said opening in the travel of the drum extending inwardly from the wall of the casing substantially to the drum, said drum having fans I on its ends.

Des Moines, Iowa, April 4:, 1930.

RAYMOND A. REID. 

